The Polish power generation system is based mostly on coal-fired power plants. Therefore, the coal mining sector is strongly sensitive to changes in the energy sector, of which decarbonization is the crucial one. The EU Emission Trading System (EU ETS) requires power generating companies to purchase European Emission Allowances (EUAs), whose prices have recently soared. They have a direct impact on the cost efficiency of hard coal-fired power generation, hence influence the consumption of hard coal on the power sector. In this context, the objective of this paper is to estimate the hard coal consumption in various regions of Poland under selected forecasts of the EUA price. To investigate this question, two models are employed:

 - the PolPower_LR model that simulates the Polish power generation system,

 - the FSM _LR model that optimizes hard coal supplies.

Three scenarios differentiated by the EUA price are designed for this study. In the first one, the average EUA price from 2014–2017 is assumed. In the second and third, the EUA prices are assumed accordingly to the NPS and the SDS scenario of the World Energy Outlook. In this study we consider only existing, modernized, under construction and announced coal-fired power generation units. The results of the study indicate that regardless of the scenario, a drop in hard coal consumption by power generation units is observed in the entire period of analysis. However, the dynamics of these changes differ. The results of this analysis prove that the volume of hard coal consumption may differ by even 136 million Mg (in total) depending on the EUA prices development scenario. The highest cumulated volume of hard coal consumption is observed in the Opolski, Radomski and Sosnowiecki region, regardless of the considered scenario.

This paper takes into account questions formulated by the Holy Mother. Her thought and consideration on the revealed word serves as pattern of theological thinking and key to understanding of the relationship between theology and other sciences. This study is based on the Church’s magisterial documents, papal teaching, as well as theological and philosophical statements. The matter of theology determines its principles, start point and methods. Its criteria consider the universal requirements of reason but, unlike in other sciences, are deeply and indispensably enrooted in ecclesial community. The purpose also distinguishes theology in the scientific world and confers particular meaning concerning its pragmatism, benefits and importance.

Two whole and four halved Brandenburg deniers were found near Międzyrzecz. They were probably a part of a hoard discovered earlier, perhaps at the turn of the 19th and 20th century. The circumstances of the discovery did not allow for obtaining metrological data, but the authenticity of the find should not raise any doubts. The coins of Margraviate origin (undoubtedly there are at least four of them: Nos 1–4), were indicatively minted in the 1275–1295 period. The last two deniers (Nos 5 and 6) are also undoubtedly Ascanian, although their Brandenburg origin is not certain (they may belong to the Anhalt or Saxon-Wittenberg issue). All identified Brandenburg deniers from the vicinity of Międzyrzecz have analogies in finds registered in Poland within present borders. This small hoard, according to the newest systematics, was hidden around the year 1300.